<!DOCTYPE html>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html">
	<meta charset="utf-8" />
	<meta http-equiv="X-UA-Compatible" content="IE=edge" />
	<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
	<title></title>
</head>
<body erke-hide>
</body>
<script>
/**
 * @param {number} num
 * @return {boolean}
 */
var isPerfectSquare = function(num) {
    var i=1;
	while(i*i<num){
		i++;
	};
	console.log(i*i==num);
	return i*i==num;
};
var res=new isPerfectSquare(16);
</script>
</html>